Choosing the Archive "skin" option from the How do you want your blog to look? section within the blog settings will show the months and how many posts and comments were made during that month.  Clicking on the month will cause all of the posts to be shown beneath it.

Example Use:

This is a good skin option to choose if you are wanting to show all of your posts that you have made over time.  Using this skin option will allow you to keep your posts all in one easy place that a user can come and view.

How to:

1. Login to your site.
   
2. Navigate to the page your blog element is on and click Settings from the blog element toolbar.
   
3. Under the How do you want your blog to look? choose Archive from the Skin dropdown menu.
   
4. Click the Update button.